To reproduce:
1. Get in minecart.
2. Click on it instead of LSHIFT.
As you see, it attempts to remove you from the minecart but cannot since the control for that was changed to LSHIFT.
Environment
Windows 8 64-Bit
Mac OS X 10.8.4
Java 7 Update 25 (and Java 6 Update 51 for Mac OS X)
Linked issues
is duplicated by 7
2 more links
Comments 5
@Platypus: see right away 2 of your bugs were fixed by MC-19163.
Confirmed.